The **M2AVS-A112-R** is a specific model of an **Active Vehicle Sensor**, typically utilized in traffic management systems, smart parking, or industrial automation for detecting the presence of vehicles. --- ### 1. Component Overview This device is an integrated electronic sensor assembly. Below is a breakdown of its primary electronic characteristics: | Feature | Specification Details | | :--- | :--- | | **Sensor Type** | Magnetoresistive (Magnetic Field Detection) | | **Detection Axis** | Usually 3-axis (X, Y, Z) to detect fluctuations in Earth's magnetic field | | **Communication Interface** | RS-485 or Wireless (depending on specific sub-variant) | | **Power Input** | Typically 3.6V (Internal Battery) or 12-24V DC (External) | | **Enclosure Rating** | IP67 / IP68 (Waterproof and Dustproof for road embedding) | --- ### 2. Key Internal Electronic Parts The internal circuitry consists of several critical subsystems: #### A. Magnetometer IC The "brain" of the sensing unit. It detects the change in the local magnetic field caused by the ferrous metal in a vehicle. * **Function:** Converts magnetic flux density into a digital signal. * **Sensitivity:** High enough to distinguish between a bicycle, a car, and a truck. #### B. Microcontroller (MCU) An ultra-low-power processor that manages the sensor data. * **Processing:** Filters out "noise" (like power lines or subway interference) using algorithms. * **State Management:** Determines if a vehicle is "Present" or "Absent." #### C. Power Management Module Since many of these units are buried in the ground, they rely on high-efficiency power components. * **Components:** Low-dropout regulators (LDO) and specialized capacitors to handle pulse loads during data transmission. #### D. Communication Physical Layer (PHY) * **Wired Models:** Utilize an RS-485 transceiver for long-distance data integrity. * **Wireless Models:** May include a Sub-GHz or LoRa radio module for transmitting data to a gateway. --- ### 3. Application Circuit Diagram (Logic) ```mermaid graph LR A[Magnetic Sensor] --> B[Signal Amplifier] B --> C[Microcontroller] C --> D[Communication Interface] E[Battery/Power Supply] --> C ``` --- ### 4. Technical Advantages * **Temperature Compensation:** Includes internal thermistors to adjust magnetic readings based on road temperature. * **Self-Calibration:** Electronic logic that allows the sensor to "re-zero" itself if the environment changes permanently (e.g., a new metal sign installed nearby).